D - Textiles – Paper – 21 – F
Patent
D - Textiles, Paper
21
F
D21F 5/02 (2006.01) D21F 5/04 (2006.01) D21F 5/06 (2006.01) D21F 5/18 (2006.01) F26B 13/00 (2006.01)
Patent
CA 2325382
A method and device effect controlled uniform temperature drying of a wet web, such as a paper web substantially immediately after formation in a paper machine, without damaging the supporting fabric carrying the web. The web has a central region and first and second border regions. The wet web to be dried is conveyed on a conventional supporting fabric/wire in a first direction generally parallel to the web border regions, and in a hood drying air is blown against the web from the opposite side thereof as the supporting fabric so that the drying air picks up moisture and becomes moistened air. The moistened air is discharged from the volume adjacent the hood, for example is discharged from at least one hood positioned at and encompassing an impingement surface over which the web and supporting fabric pass. Air supplied for blowing against the web is heated to raise its ability to retain moisture. Drying air with a first temperature and first velocity is directed against a central region of the web, and drying air with a second temperature, lower than the first temperature, and second velocity, higher than the first velocity, is directed against the web in the border regions. The hood may be divided into at least one central block and first and second border blocks, corresponding to the central region and first and second border regions of the web. A first plurality of air nozzles may be disposed within the hood central block, and second and third plurality of air nozzles disposed in the hood first and second border blocks, with a different fan and heater supplying air to each of the plurality of air nozzles.
L'invention concerne un procédé et un dispositif de régulation de la température de jets d'air de séchage soufflés en direction de la bordure d'une toile servant de support à une bande continue séchée dans la section de séchage d'une machine à papier ou analogue. Cette section de séchage comporte une hotte pourvue d'un système de séchage par convection. Ce système de séchage par convection comporte une ou plusieurs boîtes de tuyères, au moins un ventilateur destiné à souffler des jets d'air de séchage, au moins un moyen de chauffage destiné à chauffer l'air de séchage, et des moyens d'élimination de l'air humide. Des jets d'air de séchage sont soufflés depuis une partie à boîtes de tuyères formée au niveau de la partie centrale de la bande continue, en direction de cette partie centrale de la bande continue à sécher, ces jets d'air ayant une température T1 - T'1. Des jets d'air de séchage sont soufflés depuis des parties à boîtes de tuyères formées au niveau des deux zones de bordure de la bande continue, en direction des zones de bordure de la bande continue, ces jets d'air ayant une température T2 - T'2 inférieure à T1 - T'1.
Norri Petri
Nurmi Jarkko
Sundqvist Hans
Veijola Jarkko
Gowling Lafleur Henderson Llp
Metso Paper Inc.
Valmet Corporation
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